Add template-dependency command

README.md

@@ -138,6 +138,25 @@ Apply the generated template:
 kubectl apply -f sumologic.yaml
 ```
 
+## Template dependency configuration
+
+There could be scenarios when you want to get the configuration of the subcharts (prometheus-operator, fluent-bit, etc.).
+
+Command `template-dependency` takes part of the upstream `values.yaml` file basing on the given key:
+
+```
+ kubectl run template-dependency \
+  -it --rm \
+  --restart=Never -n sumologic \
+  --image sumologic/kubernetes-tools \
+  -- template-dependency prometheus-operator
+```
+
+This command will return our configuration of `prometheus-operator` ready to apply for the `prometheus-operator` helm chart.
+
+You can add additional parameters (like `--version=1.0.0`) at the end of the command.
+List of supported arguments is compatible with `helm show values`.
+
 ## Interactive mode
 
 The pod can be also run in interactive mode:

deploy/docker/Dockerfile

@@ -14,8 +14,6 @@ RUN find / -name libgcc_s.so.1
 
 FROM alpine:3.9
 RUN set -ex \
-    && echo "http://dl-cdn.alpinelinux.org/alpine/edge/main" >> /etc/apk/repositories \
-    && echo "http://dl-cdn.alpinelinux.org/alpine/edge/testing" >> /etc/apk/repositories \
     && apk update \
     && apk upgrade \
     && apk add --no-cache \
@@ -39,6 +37,10 @@ ADD ./src/commands/check /usr/bin/check
 ADD ./src/commands/fix-log-symlinks /usr/bin/fix-log-symlinks
 ADD ./src/commands/tools-usage /usr/bin/tools-usage
 ADD ./src/commands/template /usr/bin/template
+ADD ./src/commands/template-dependency /usr/bin/template-dependency
+
+RUN curl -LJ https://github.com/mikefarah/yq/releases/download/3.2.1/yq_linux_amd64 -o /usr/bin/yq
+RUN chmod +x /usr/bin/yq
 
 COPY --from=builder /build/k8s-api-test /usr/bin/
 COPY --from=builder /build/stress-tester /usr/bin/

src/commands/template-dependency

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+
+key="${1}"
+shift
+
+echo '# Add sumologic repository'
+helm repo add sumologic https://sumologic.github.io/sumologic-kubernetes-collection 1>/dev/null 2>&1
+echo '# Update repository'
+helm repo update 1>/dev/null 2>&1
+echo "# Generating override for ${key}"
+helm show values $@ sumologic/sumologic | yq r - "${key}"